Apparatus for administering anesthetics



Sept. 4, 1945. H. A. E. TALLEY 2,334,354

' APPARATUS FOR ADMINISTERING ANAESTHETICS I Original Filed Nov. 27, 1943 0 O ,y A/

B I u! 4.17 I: 1 /3 A H a Patented Sept. 4, 1945 MTEDSTATEs PATENT i I I 2,384,354 1 1 i;

APPARATUS FOR ADIVHNISTERING ANESTH'ETIOS Henry Alfred Ernest Talley, London, England,'as'- signor to Medical & Industrial Equipment Limited, London, England, a company of Great i v i Britain Divided and this application March 31, 1944, Serial No. 528,828. In Great Britain March 4, 1943 6 Claims.

This invention relates to apparatus for administering anesthetics and for other medical gas therapy, its object being to provide an improved control device in the form of afineadjustment valve disposedon the negative pressure side of the anesthetics or like apparatus. The present invention is a division of an application filed by me November 27-, 1943, Serial No. 512,072, for Oxy-acetylene welding or cutting equipment.

The control device is applicable to apparatus for the continuous flow 1 or administration of gaseous anesthetics for instance nitrous oxide and oxygen, as well as toapparatus used for oxygen therapy and to apparatus for the automatic or intermittent administration of gas.

The control means or fine adjustment valve according to the present invention consists of'an outer body or housing in which is seated an inner body preferably, in shape, similar to that of the outer body and advantageously stepped; The inner body is secured in the outerbody with the interpolation of gas tight washers or-the' like there being however a space between the bottom surface of the inner body and the inside surface of the bottom part of the outerbody.

A longitudinal passage is provided in the inner body throughwhich passes a screw-threaded stem fitted with a valve plate or the like which is disposed Within the space between the twobottoms of the inner and outer bodies, said: stem being capable of vertical adjustment by means of a knob or knurled head. external of the outer body such that said valve plate can be adjusted to close an outlet orifice in the bottom of the inner memher. The inner member, further, has a passage which is advantageously L-shaped one end having its mouth or outlet orifice in the bottom surface of the inner body and its-other mouth .or inlet orifice laterally disposed; to coincide with an inlet opening in the wall of the outer member.

Thus by closing the valve outlet mouth of the inner body nothing can pass through the outlet opening but by varying the distance of such valve plate from the outlet opening, air, for instance, or other gas, can pass through the inlet opening, into the passage in the inner body and out through the outlet opening.

In order that the voliune of gas can be adjusted to give a constant percentage entrainment value the upper surface of the valve plate has a control pin, advantageously tapered, which engages in the end or mouth of the inlet passage at the bottom of the inner body whilst a guide rod is also preferably carried by the valve plate to engagein another short passage in the lower end of the inner body. Finally there may bepro: vided four diametral bores or passages housing springs which bear on the upper surface of the valve plate and assist in pressing the said valve disc towards the outlet orifice of the outer body, as shown and described in the aforesaid application. 1

By calculating the sizes of the gas inlet passage and the size of the control pin extending thereinto correct percentage of gas is obtained at all positions of the valve plate whichis, as stated, regulated by theouter knob acting on the screwthreaded stem of such'valve. a Y

In apparatus for oxygen therapy for the continuous administration'of pure oxygen or oxygen and air mixtures there would be the usual oxygen reducing valve and its fine adjustmentvalve connected up to the oxygen cylinder or other supply means, as well as the regulator which discharges through a jet and venturi, .The control device, according to the present invention is applied to act on the negative pressure produced toensure the constant percentage mixing of oxygen and air re gardless of the volume of oxygen. The oxygen alone, i. e. when the control means is closed, or the oxygen/ air mixture, is delivered to the patient through an inhaler for the noseor nose and mouth which is fitted with a reservoirr bag, in;- spiratory and expiratory valves and connecting tube to the outlet of the'Venturi tube. An inlet relief valve is also fitted to the inhalerto admit air should the volume of gas deliveredto the inhaler be less than the quantity required by the patient. 1 v,

In its application to continuous flow nitrous oxide and oxygen apparatus for the continuous administration of gaseous-anesthetics consisting of av nitrous oxidefine adjustment fiow valve feeding a jet and Venturi tube-the negativepres sure obtained isapplied to a sensitive demand type regulating device of known construction supplied with oxygen, the amount of oxygen .allowed to pass through being controlledb the control means according to this invention which will permit of, constant percentage mixing of nitrous oxide and oxygen regardless of 1 the volume of nitrous oxide. 7 Y H i I a The fine adjustment flow valve and the ser 1 si tive demand type regulating device for oxygen are supplied with their respective gases byorthodox pressure regulators at appropriate pressures, these regulators being attached to the gas cylinder according to normal practice. The apparatus is fitted with emergency oxygen control; means to permit of flooding-the apparatus with oxygen Fig. 1; Fig. 3 shows an enlargedview of a de-;

tail.

The fine adjustment valve illustrated consists of an outer body A which is preferably stepped as at B to form a seating or support for an inner body 0 which latter generally has a similar contour to the outer body A. -The' outer body constitutes a casing and the inner bodyis fitted within the outer body and terminates short of the lower end thereof and is spaced from the anesthetics and for medical gas therapy comprising an outer body forming an outer casing and having a stepped formation and provided at the bottom with an outlet port and having an inlet port at the upper portion, an inner body of stepped formation conforming to the configuration of and fitted within the outer body andterminating short of the lower end of the same to form a valve chamber below the inner body, said inner body being provided with a passage extending from the bottom surface of the inner body to the inlet port of the outer body and establishing communication between the inlet port and the valve chamber, freely movable valve means located within the valve chamfber for-partially and completely obturating said w passage, and adjustable means for limiting the same to provide a valve chamber M. The outer and inner bodies are provided at the top with laterally extending annular flanges N' and O which are perforated for the reception of fastening devices P detachably securing the inner and outer bodies together. The outer body A has an inlet port or aperture D and an outlet port 01 aperture E. The inner body C has a passage F leading from its lower surface upwardly to the inlet port D of the outer body A and establishing communication between said inlet port and the valve chamber. can be L-shaped and gives connection between the inlet D and the outlet E as will be seen. The inner body C has a vertical bore for the passage Advantageously this passage F of a valve stem G connected to a valve member or plate H which can be made to close the lower end of the passage F or can be adjusted relatively theretoby an external nut, knob or the like I coacting with a screw-thread on the upper end; i. e, the end remote from the valve itself. The valve H is generally provided with asteady pin J with or without a surrounding coiled spring (not shown) which latter merely serves to tend to thrust the valve H away from the bottom of the inner body C. Coiled springs l3 may be interposed between the inner body and the plate to tend to force the plate away from the bottom of the inner body. The valve also has a tapered pin K which enters the end of the passage F to more or less close the same and thereby permit of regulating, in conjunction with the nut I or the like, the amount of gas or other fluid entering at D and'discharging at E so giving extremely fine adjustment in a very simple manner. A suitable washer L may be interpolated between the outer body A and inner body C if necessary.

I claim: 1. A fine adjustment valve for administering anesthetics and for medical gas therapy comprising an outer body forming an outer casing and provided at the bottom with an outlet port and having an inlet port at the upper portion, an inner body conforming to the configuration of the interior of the outer body and fitted within the same and terminating short of the lower end thereof to form a valve chamber below the inner body, said inner body being provided with a passage communicating with said inlet port and valve chamber and terminating at the lower surface of said inner body, freely movable valve means located within'the valve chamber for partially and completely obturating said passage to control the discharge of fluid from the outer body, and adjustable means for limiting the movement of the valve means.

2. A fine adjustment valve for administering Ill ' free movement of the valve means.

3. A fine adjustment valve for administering anesthetics and for medical gas therapy comprising an outer body forming an outer casing and provided at the bottom with an outlet port and having'a lateral inlet port at the upper portion,'an inner body conforming to the configuration of theinterior of the outer body and fitted within the same and terminating short of the lower end thereof to form a valve chamber below the inner body, said inner body being provided with an L-shaped passage communicating with said inlet port and valve chamber and terminating at the lower surface of said inner body, freely movable valve means located within the valve chamber for partially and completely obturating said passage to control the discharge of fluid from the outer body, and adjustable means for limiting the movement of the valve means.

4. A fine'adjustment valve for administering anesthetics and for medical gas therapy comprisingan outer body forming an outer casing and provided at the bottom with an outlet port and having an inlet port at the upper portion, an inner body conforming to the configuration of the interior of the outer body and fitted within the same and terminating short of the lower end thereof to form a valve chamber below the inner body, said inner body being provided with a passage communicating with said inlet port and valve chamber and terminating at the lower surface of said inner body, a valve plate located with the valve chamber and provided with means for partially and completely obturating said passage to control the discharge of fluid from the outer body, said valve plate being provided with a stem having free sliding movement in and guided by the inner body and provided with adjustable means for engaging the inner body to limit'the extent of said free sliding movement.

5.A fine adjustment valve for administering anesthetics and for medical gas therapy consisting of an outer body, an inlet port for fluid in said outer body and an outlet port therein, an inner body fitted within the outer body, a communicating passage in'said inner body whose upper end coincides with the inlet of the outer body while its lower end has its mouth in the bottom surface of said inner body, and means for controlling the discharge of fluid from the outer body consisting of a valve plate, a tapered pin carried by the valve plate and adapted to enter the mouth of the communicating passage, and a steady pin being also provided on the valve plate to engage in a corresponding bore in the base of the inner body.

6. A fine adjustment valve for administering anesthetics and for medical gas therapy consistplate at the end of a screw threaded spindle, a tapered control pin on said valve plate to engage in the mouth of the communicating passage, a steady pin on said plate to engage in a bore therefor provided in the inner body, and recoil springs between the inner body and the plate to tend to force the plate away from the bottom of the inner body.

HENRY ALFRED ERNEST TALLEY. 

